diff --git a/modules/ui/raw_tag_editor.js b/modules/ui/raw_tag_editor.js
index 4b6a364e2..c24cd85ee 100644
--- a/modules/ui/raw_tag_editor.js
+++ b/modules/ui/raw_tag_editor.js
@@ -322,7 +322,10 @@ export function uiRawTagEditor(context) {
         function rowsToText(rows) {
             var str = rows
                 .filter(function(row) { return row.key && row.key.trim() !== ''; })
-                .map(function(row) { return stringify(row.key) + '=' + stringify(row.value); })
+                .map(function(row) {
+                    var val = row.value ? stringify(row.value) : '';
+                    return stringify(row.key) + '=' + val;
+                })
                 .join('\n');
 
             return _state === 'hover' ? str : str + '\n';